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<?xml version="1.0"?>
<!--
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
-->
<!--
This document uses JSP 2.0 EL as the expressions language.
-->
<scxml xmlns="http://www.w3.org/2005/07/scxml"
xmlns:cs="http://commons.apache.org/scxml"
version="1.0"
initialstate="microwave">
<!-- trivial microwave oven example -->
<!-- using parallel and In() predicate -->
<parallel id="microwave">
<state id="oven">
<initial>
<transition target="off"/>
</initial>
<state id="off">
<!-- off state -->
<transition event="turn_on" target="on"/>
</state>
<state id="on">
<initial>
<transition target="idle"/>
</initial>
<!-- on/pause state -->
<onentry>
<!-- we assume the cook_time is passed in as a context parameter -->
<if cond="${empty cook_time}">
<!-- default setting -->
<cs:var name="cook_time" expr="${5}"/>
</if>
<!-- timer variable -->
<cs:var name="timer" expr="${0}"/>
</onentry>
<transition event="turn_off" target="off"/>
<transition cond="${timer ge cook_time}" target="off"/>
<state id="idle">
<transition cond="${In('closed')}" target="cooking"/>
</state>
<state id="cooking">
<transition cond="${not In('closed')}" target="idle"/>
<transition event="time" target="cooking">
<assign name="timer" expr="${timer + 1}"/>
</transition>
</state>
</state>
</state>
<state id="door">
<initial>
<transition target="closed"/>
</initial>
<state id="closed">
<transition event="door_open" target="open"/>
</state>
<state id="open">
<transition event="door_close" target="closed"/>
</state>
</state>
</parallel>
</scxml>
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